JP6840657B2 - Undulating gate - Google Patents

Description

The present application relates to undulating gates.

Conventionally, undulating gates for preventing flooding and tsunami inundation have been known. For example, the undulating gate disclosed in Patent Document 1 includes a door body that stands up by the buoyancy of water when flooded. Further, the undulating gate is provided with an auxiliary drive unit that generates an erection moment for assisting the erection operation of the door body. That is, a wire rope is attached to the tip of the door body, and a counterweight is attached to the wire rope. A tensile force due to the counterweight acts on the door body in the collapsed state, and this tensile force assists the standing operation of the door body.

Japanese Unexamined Patent Publication No. 2015-180806

By the way, in the undulating gate as described above, it may be desired to manually erect the door body when performing maintenance or inspection. Therefore, in order to reduce the manual force required for standing up, it is desirable to design the auxiliary drive unit so that the magnitude of the standing moment of the door body is as close as possible to the magnitude of the lodging moment. However, if the magnitude of the standing moment by the auxiliary drive unit is close to the magnitude of the lodging moment, for example, the door body in the tilted state may easily move in the standing direction for some reason such as wind. .. In addition, during maintenance or inspection, the upright door body may easily move in the lodging direction for some reason.

The technique disclosed in the present application has been made in view of such circumstances, and the purpose is to reduce the manual force for erecting the door body as much as possible in the undulating gate provided with the auxiliary drive unit for the erecting operation of the door body. Further, it is to prevent the door body in the laid state or the standing state from easily moving in the standing direction or the laying direction.

The undulating gate of the present application includes a door body and an auxiliary drive unit. The door body has a rotation shaft, and rotates around the rotation shaft to stand up. The auxiliary drive unit exerts a tensile force on the door body to assist the standing operation of the door body. The auxiliary drive unit includes a constant load unit, an elastic load unit, and a transmission unit. The constant load portion generates a constant load. The elastic load portion is provided in a state of being displaced by a predetermined amount from the natural length while generating an elastic load according to the displacement amount, and the displacement amount from the natural length becomes smaller as the door body stands up, and the door It is configured so that the displacement amount becomes zero before the body is completely upright. The transmission portion is connected to the door body, and the constant load of the constant load portion and the elastic load of the elastic load portion act on the door body as the tensile force, and the rotation of the tensile force with respect to the acting direction. The vertical distance between the shafts is configured to be the longest during the standing of the door body.

Further, the undulating gate of the present application includes a door body and an auxiliary drive unit. The door body has a rotation shaft, and rotates around the rotation shaft to stand up. The auxiliary drive unit exerts a tensile force on the door body to assist the standing operation of the door body. Then, in the initial stage of the standing operation of the door body including the falling state of the door body, the standing moment of the door body generated by the action of the tensile force of the auxiliary driving unit is smaller than the falling moment of the door body. The tensile force is changed so as to be. Further, the auxiliary drive unit changes the tensile force so that the standing moment becomes larger than the lodging moment in the latter stage of the standing operation of the door body including the standing completed state of the door body. Further, the auxiliary driving unit changes the tensile force so that the standing moment becomes about the same as the lodging moment in the middle stage between the early stage and the late stage of the standing operation.

According to the undulating gate of the present application, it is possible to prevent the door body in the laid-down state or the laid-down state from easily moving in the erected direction or the laid-down direction while reducing the manual force for raising the door body as much as possible. ..

FIG. 1 is a diagram showing a schematic configuration of an undulating gate according to an embodiment when it is laid down, as viewed from the upstream side. FIG. 2 is a view showing a schematic configuration of the undulating gate according to the embodiment when it is laid down, as viewed from the side surface side. FIG. 3 is a view corresponding to FIG. 2 showing a schematic configuration of the undulating gate when the undulating gate is erected. FIG. 4 is a diagram showing a main part of the auxiliary drive unit during standing up. FIG. 5 is a graph showing changes in the counterweight load and the spring load with respect to the standing angle of the door body. FIG. 6 is a graph showing a change in the standing moment with respect to the standing angle of the door body. FIG. 7 is a graph showing a change in the lever length of the torque arm with respect to the standing angle of the door body. FIG. 8 is a graph showing changes in the lodging moment and the standing moment with respect to the standing angle of the door body. FIG. 9 is a graph showing the change in the required manual force with respect to the standing angle of the door body.

Hereinafter, embodiments of the present application will be described with reference to the drawings. It should be noted that the following embodiments are essentially preferred examples and are not intended to limit the scope of the techniques disclosed in the present application, their applications, or their uses.

The undulating gate 1 of the present embodiment is installed on the road surface R (land), for example, to prevent water from entering the living space or the underground space due to flood, tsunami, or heavy rain. The undulating gate 1 is a floating undulating gate (sometimes also referred to as a floating flap gate) that automatically performs an upright operation and an undulating operation by using water to enter.

As shown in FIGS. 1 to 3, the undulating gate 1 includes a door body 10, a door stop 16, and an auxiliary drive unit 20. In addition, in FIG. 2 and FIG. 3, water shall infiltrate from the left side. Further, the "upstream side" and "downstream side" described below are intended to be the upstream side (left side in FIGS. 2 and 3) and the downstream side (right side in FIGS. 2 and 3) in the water intrusion direction.

The door body 10 has a main body 11 formed in a slightly flat and substantially rectangular body, and a torque arm 13. The main body 11 has a rotation shaft 12 on the base end side (for example, the right side in FIG. 2), and is rotatably provided around the rotation shaft 12. The door body 10 performs an upright operation by rotating the main body 11 clockwise in FIG. 2, and performs a lodging operation by rotating the main body 11 counterclockwise in FIG. The door body 10 is in a prone state (the state shown in FIG. 2) in a normal state (that is, when water does not infiltrate), and invades water in an emergency (that is, when water invades). It is configured to rotate and stand up from the prone state by the buoyancy of. That is, the door body 10 automatically starts the standing operation by using the infiltrated water.

The road surface R is provided with a concave storage portion 17. The storage unit 17 is formed in a rectangular shape larger than the door body 10 in a plan view, and the collapsed door body 10 is stored. When the door body 10 is stored in the storage portion 17, that is, when the door body 10 is laid down, the upper surface portion of the door body 10 (main body 11) and the road surface R are substantially flush with each other. Normally, a vehicle or a person passing through the road surface R will pass through the upper surface portion of the door body 10. That is, the door body 10 in the collapsed state constitutes a part of the road surface R.

As shown in FIG. 1, one torque arm 13 is provided at each end of the main body 11 in the width direction (left-right direction in FIG. 1). The torque arm 13 is provided on the downstream side surface of the main body 11 (that is, the upper surface portion of the main body 11 when lying down), and protrudes from the downstream side surface thereof. More specifically, the torque arm 13 is provided in the vicinity of the rotation shaft 12 on the base end side of the main body 11. A wire rope 31 of an auxiliary drive unit 20, which will be described later, is connected to the torque arm 13, and a tensile force acts to assist the standing operation of the door body 10.

As shown in FIG. 1, the door stop 16 is provided on the left side and the right side of the door body 10 when viewed from the upstream side. The door body 10 is provided with a watertight portion 14 on the side surface portion of the main body 11 which is a portion facing the door stop 16, and the door body 10 is watertight when the watertight portion 14 comes into contact with the door stop 16. The watertight portion 14 is made of, for example, watertight rubber.

The auxiliary drive unit 20 assists the standing operation of the door body 10. Auxiliary drive units 20 are provided one by one at positions corresponding to both ends in the width direction of the door body 10 on the downstream side of the door body 10. The auxiliary drive unit 20 includes a base plate 21, a guide member 22, a counterweight 23, springs 24 and 25, a wire rope 31, and fixed pulleys 32 and 33. Each auxiliary drive unit 20 is installed inside the housing 18.

The base plate 21 is a plate-shaped member, and is provided in a state in which the plane direction coincides with the horizontal direction. The guide member 22 is a rod-shaped member extending in the vertical direction, and two guide members 22 are arranged in the upstream and downstream directions. A guide member 22 penetrates the base plate 21 in the vertical direction, and the base plate 21 is supported by the guide member 22 so as to be vertically movable. That is, the guide member 22 is a member that guides the vertical movement of the base plate 21. The fixed pulleys 32 and 33 are provided one at an upper position and one at a lower position of the base plate 21. One end of the wire rope 31 is connected to the base plate 21. The other end of the wire rope 31 is connected to the torque arm 13 of the door body 10 via the upper fixed pulley 32 and the lower fixed pulley 33 in this order.

The counterweight 23 is installed on the upper surface of the base plate 21, and corresponds to the constant load portion according to the claim of the present application. The springs 24 and 25 are coil springs that expand and contract in the vertical direction, and constitute a compression spring that is used in a compressed state. The springs 24 and 25 are provided on the upper surface of the base plate 21, and correspond to the elastic load portion according to the claim of the present application. Specifically, the guide member 22 is provided with a fixing plate 26 in a portion above the base plate 21. The fixing plate 26 is a member that is fixed to the guide member 22 and does not displace.

Further, the guide member 22 is provided with two springs 24 and 25 vertically between the fixing plate 26 and the base plate 21. That is, the guide member 22 is inserted into the two springs 24 and 25 arranged vertically. A movable plate 27 is provided between the two springs 24 and 25. The guide member 22 penetrates the movable plate 27 in the vertical direction so that the movable plate 27 can move up and down. Both ends of the two springs 24 and 25 are not connected to the fixed plate 26, the movable plate 27 and the base plate 21.

As shown in FIG. 2, in a state where the door body 10 is laid down, both ends of the upper spring 24 are in contact with the fixed plate 26 and the movable plate 27 in a compressed state. On the other hand, both ends of the lower springs 24 and 25 are in contact with the movable plate 27 and the base plate 21 in a compressed state. At this time, the lengths Lb of the two springs 24 and 25 are the same as each other and shorter than the natural length La.

In the auxiliary drive unit 20 configured in this way, the weight of the counterweight 23 (hereinafter, also referred to as counterweight load Fc) and the elastic force of the springs 24, 25 (hereinafter, spring load Fs) act downward. That is, both the constant load (counter weight load Fc) of the constant load portion and the elastic load (spring load Fs) of the elastic load portion act downward on the base plate 21. Then, the sum of the counterweight load Fc and the spring load Fs (Fc + Fs) acts as a tensile force F on the torque arm 13 via the base plate 21 and the wire rope 31. This tensile force F is a force that assists the standing operation of the door body 10. In the auxiliary drive unit 20, the base plate 21 and the wire rope 31 form a transmission unit that transmits the counterweight load Fc and the spring load Fs to the torque arm 13 of the door body 10 as a tensile force F.

When water enters the door body 10, the door body 10 starts an upright operation due to the buoyancy of the infiltrated water. Then, the door body 10 stands up as the water level rises, and when the standing angle θ reaches the standing completion angle, the standing operation is completed (state shown in FIG. 3). At that time, since the tensile force F by the auxiliary drive unit 20 acts on the torque arm 13 of the door body 10, the door body 10 is pulled in the standing direction to assist the standing operation. The base plate 21 descends as the door body 10 stands up, and rises as the door body 10 falls down. As shown in FIG. 3, the standing angle θ is the inclination angle of the door body 10 with respect to the horizontal direction.

A more detailed configuration and operation of the auxiliary drive unit 20, and a manual force required for manually raising the door body 10 will be described with reference to FIGS. 4 to 9.

The auxiliary drive unit 20 is configured so that the tensile force F acting on the torque arm 13 automatically changes from the time when the door body 10 falls down to the time when the door body 10 is completely upright. As shown in FIG. 5, the counterweight load Fc extends from the standing angle θ of the door body 10 from 0 ° (falling state shown in FIG. 2) to the standing completion angle θc (standing complete state shown in FIG. 3). Is constant.

On the other hand, the spring load Fs decreases almost proportionally from the standing angle θ from 0 ° to the second angle θb, and becomes zero until the standing angle θ changes from the second angle θb to the standing completion angle θc. It is configured in. The standing completion angle θc is, for example, 80 °, and the second angle θb is an angle before the door body 10 is completed standing, for example, 70 °.

The springs 24 and 25 are provided in a state of a length Lb shorter than the natural length La when the standing angle θ is 0 °, that is, in a state of being displaced (contracted) by a predetermined amount (La-Lb) from the natural length La. ing. The springs 24 and 25 extend in contact with the fixed plate 26, the movable plate 27, and the base plate 21 at both ends until the standing angle θ changes from 0 ° to the second angle θb. That is, when the standing angle θ is from 0 ° to the second angle θb, as the standing angle θ increases, the lengths of the springs 24 and 25 gradually increase from the initial length Lb, and the spring load Fs gradually decreases. .. Then, when the standing angle θ becomes the second angle θb, the lengths of the springs 24 and 25 reach the natural length La, as shown in FIG. At this time, both ends of the springs 24 and 25 are in contact with the fixed plate 26, the movable plate 27, and the base plate 21.

When the standing angle θ exceeds the second angle θb, the base plate 21 is further lowered, and the two springs 24 and 25 and the movable plate 27 are lowered by their own weights, respectively. That is, the two springs 24 and 25 and the movable plate 27 descend following the descent of the base plate 21. Therefore, one end (upper end) of the upper spring 24 is separated from the fixing plate 26, and a gap S is generated between the spring 24 and the fixing plate 26. Therefore, until the standing angle θ changes from the second angle θb to the standing completion angle θc, the springs 24 and 25 descend with their natural length La. Therefore, the spring load Fs does not occur. In this way, the spring load Fs decreases proportionally from the standing angle θ from 0 ° to the second angle θb, and becomes zero until the standing angle θ changes from the second angle θb to the standing completion angle θc. That is, when the standing angle θ is the second angle θb or more, only the counterweight load Fc acts as the tensile force F.

When the tensile force F by the auxiliary drive unit 20 acts on the torque arm 13, an upright moment Mu for erecting the door body 10 is generated. That is, this standing moment Mu is the sum (Mc + Ms) of the standing moment Mc generated by the counterweight load Fc and the standing moment Ms generated by the spring load Fs. As shown in FIG. 6, the standing moment Mc due to the counterweight load Fc does not change so much depending on the standing angle θ. On the other hand, the standing moment Ms due to the spring load Fs decreases as the standing angle θ increases, and becomes zero when the standing angle θ is the second angle θb or more. Therefore, the standing moment Mu acting on the door body 10 by the auxiliary driving unit 20 gradually decreases until the standing angle θ changes from 0 ° to the second angle θb, and does not decrease so much when the standing angle θ is greater than or equal to the second angle θb. .. The standing moment Mu assists the standing operation of the door body 10.

On the other hand, as shown in FIG. 7, the lodging moment Md at which the door body 10 tries to fall down decreases as the standing angle θ increases. That is, the lodging moment Md is the maximum when the standing angle θ is 0 °, and is the minimum when the standing angle θ is the standing completion angle θc. In FIG. 7, for convenience, the standing moment Mu is shown as a positive value, and the lodging moment Md acting in the direction opposite to the standing moment Mu is shown as a negative value.

As shown in FIG. 7, the standing moment Mu is substantially as large as the lodging moment Md when the standing angle θ is between the first angle θa (an angle smaller than the second angle θb) and the second angle θb. It is designed to be. Strictly speaking, when the standing angle θ is between the first angle θa and the second angle θb, the standing moment Mu is slightly smaller than the lodging moment Md. When the standing angle θ is the second angle θb or more, the degree of decrease of the standing moment Mu is smaller than the degree of decrease of the lodging moment Md. That is, when the standing angle θ is equal to or larger than the second angle θb, the standing moment Mu is substantially larger than the lodging moment Md. Then, the difference between the standing moment Mu and the lodging moment Md increases as the standing completion angle θc approaches. The first angle θa is, for example, 35 °.

Further, the auxiliary drive unit 20 is configured such that the magnitude of the standing moment Mu is smaller than the lodging moment Md when the standing angle θ is between 0 ° and the first angle θa. First, the magnitude of the standing moment Mu when the standing angle θ is 0 ° is set smaller than the lodging moment Md when the standing angle θ is 0 °.

As shown in FIG. 8, the standing moment Mu is represented by the product of the tensile force F by the auxiliary drive unit 20 and the lever length of the torque arm 13. The wire rope 31 is connected to a connecting portion 13a located at the tip of the torque arm 13. The lever length of the torque arm 13 is the vertical distance of the rotating shaft 12 with respect to the pulling direction of the wire rope 31.

The lever length is the longest when the standing angle θ is the third angle θr (an angle larger than 0 ° and smaller than the second angle θb). That is, the lever length becomes longer as the standing angle θ increases when the standing angle θ is between 0 ° and the third angle θr. For example, if the lever length when the standing angle θ is the third angle θr is R2, the lever length R2 is longer than the lever length R1 when the standing angle θ is 0 °. When the standing angle θ is the third angle θr or more, the lever length becomes shorter as the standing angle θ becomes larger. For example, if the lever length when the standing angle θ is the third angle θr is R2, the lever length R2 is longer than the lever length R3 when the standing angle θ is the standing completion angle θc. That is, the standing angle θ at which the lever length is the longest is set to an angle during the standing operation. In this way, the lever length is designed to gradually increase until the door body 10 stands up to some extent from the collapsed state, and then gradually decrease after that.

On the other hand, the tensile force F by the auxiliary driving unit 20 becomes smaller as the standing angle θ becomes larger when the standing angle θ is between 0 ° and the second angle θb. That is, when the standing angle θ is between 0 ° and the second angle θb, the counter weight load Fc is constant, but the spring load Fs decreases as the standing angle θ increases, so that the counter weight load Fc and the spring load Fs The tensile force F, which is the sum of and, decreases as the standing angle θ increases.

As described above, from 0 ° to the third angle θr, the tensile force F decreases while the lever length increases, so that the standing moment Mu does not decrease so much. Therefore, when the standing angle θ is between 0 ° and the first angle θa, the degree of decrease of the standing moment Mu can be made smaller than the degree of decrease of the lodging moment Md. Then, when the standing angle θ is 0 °, the standing moment Mu is smaller than the lodging moment Md, but the difference between the two becomes smaller as the standing angle θ increases from 0 °. Therefore, when the standing angle θ is the first angle θa, the difference between the standing moment Mu and the lodging moment Md is designed to be substantially zero, so that the standing angle θ reaches the first angle θa. The magnitude of the moment Mu can be made substantially the same as the lodging moment Md.

As described above, the standing moment Mu acting on the door body 10 by the auxiliary driving unit 20 is smaller than the lodging moment Md when the standing angle θ is between 0 ° and the first angle θa, and the standing angle θ is the second. Between the angle θb and the standing completion angle θc, it becomes larger than the lodging moment Md. Further, when the standing angle θ is between the first angle θa and the second angle θb, the standing moment Mu is substantially the same as the lodging moment Md.

As a result, the manual force required to manually erect the door body 10 during maintenance and inspection tends to be as shown in FIG. 9 according to the erecting angle θ. Specifically, when the standing angle θ is between the first angle θa and the second angle θb (that is, in the middle of the standing motion), the standing moment Mu and the lodging moment Md are about the same, so that the manual force P2 is weak. It becomes a thing.

Further, when the standing angle θ is between 0 ° and the first angle θa (that is, the initial stage of the standing operation), the standing moment Mu is smaller than the lodging moment Md, so that a manual force larger than the above-mentioned manual force P2 is required. Become. In this case, the maximum manual force P1 is required when the standing angle θ is 0 °, and the manual force decreases as the standing angle θ increases.

Further, when the standing angle θ is between the second angle θb and the standing completion angle θc (that is, the latter half of the standing operation), the standing moment Mu is larger than the lodging moment Md, so that the manual force is substantially zero. That is, when the standing angle θ is the second angle θb or more, the door body 10 stands up to the standing complete state only by the auxiliary force by the auxiliary driving unit 20 without applying a manual force.

As described above, the undulating gate 1 of the above embodiment includes an auxiliary driving unit 20 that exerts a tensile force F on the door body 10 to assist the standing operation of the door body 10. Then, in the initial stage of the standing operation of the door body 10 including the lying state of the door body 10, the auxiliary driving unit 20 has a tensile force so that the standing moment Mu generated by the action of the tensile force F becomes smaller than the lodging moment Md. Change F. Further, the auxiliary drive unit 20 changes the tensile force F so that the standing moment Mu becomes larger than the lodging moment Md in the latter stage of the standing operation of the door body 10 including the standing completed state of the door body 10. Further, the auxiliary drive unit 20 changes the tensile force F so that the standing moment Mu becomes about the same as the lodging moment Md in the middle period between the early stage and the late stage of the standing operation.

Specifically, the auxiliary drive unit 20 of the above embodiment includes a constant load unit (counterweight 23), an elastic load unit (springs 24 and 25), and a transmission unit (base plate 21 and wire rope 31). There is. The constant load unit generates a constant load (counterweight load Fc). The elastic load portion is provided in a state where an elastic load (spring load Fs) is generated according to the amount of displacement and is displaced by a predetermined amount from the natural length La, and the amount of displacement from the natural length La increases as the door body 10 stands up. It is configured so that it becomes smaller and the displacement amount becomes zero before the door body 10 completes standing up. The transmission portion is connected to the door body 10, and the constant load of the constant load portion and the elastic load of the elastic load portion act on the door body 10 as a tensile force F, and the rotation shaft 12 is perpendicular to the acting direction of the tensile force F. The distance (lever length) is configured to be the longest during the standing of the door body 10.

According to the above configuration, the standing moment Mu becomes smaller than the lodging moment Md at the initial stage of the standing motion, the standing moment Mu becomes about the same as the lodging moment Md at the middle stage of the standing motion, and the standing moment Mu becomes the same as the lodging moment Md at the latter stage of the standing motion. It can be designed so that the moment Mu is larger than the lodging moment Md.

As a result, the manual force required to manually erect the door body 10 during maintenance and inspection can be reduced as much as possible in the middle stage of the erecting operation. Further, since the lodging moment Md is larger than the standing moment Mu at the initial stage of the standing operation, it is possible to prevent the door body 10 in the lying state from easily moving in the standing direction due to wind or the like. Further, since the standing moment Mu is larger than the lodging moment Md in the latter stage of the standing operation, it is possible to prevent the door body 10 in the standing state from easily moving in the lodging direction due to wind or the like.

Further, in the undulating gate 1 of the above embodiment, a counterweight 23 is used as the constant load portion, and coil springs (springs 24 and 25) are used as the elastic load portion. Therefore, the function of the auxiliary drive unit 20 described above can be exhibited with a simple configuration.

Further, in the undulating gate 1 of the above embodiment, the transmission portion is provided so as to be movable up and down, and the base plate 21 in which the constant load of the constant load portion and the elastic load of the elastic load portion act downward, and one end of the base plate. It has a wire rope 31 connected to 21 and the other end connected to the door body 10. Specifically, the auxiliary drive unit 20 uses compression springs (springs 24 and 25) as the elastic load unit. A counterweight 23 as a constant load portion is placed on the base plate 21, and a compression spring is provided above the base plate 21 so that the tip of the compression spring is in contact with the base plate 21. According to this configuration, the action directions of the counterweight load Fc (constant load) and the spring load Fs (elastic load) can be matched downward, so that the configuration of the transmission unit is simplified.

Further, according to the undulating gate 1 of the above embodiment, the wire rope 31 is connected to the base end side (rotating shaft 12 side) of the door body 10. Therefore, the length of the wire rope 31 and the pulling stroke of the wire rope 31 can be suppressed shorter than, for example, as compared with the case where the wire rope is connected to the tip end side of the door body 10. Therefore, the equipment can be miniaturized.

In the above embodiment, the compression spring is used as the elastic load portion, but a tension spring may be used. Further, in the above embodiment, the coil spring is used as the elastic load portion, but another elastic member such as an air spring may be used.

Further, in the above embodiment, the wire rope 31 is connected to the base end side of the door body 10, but may be connected to the center or the tip end side of the door body 10.

Further, in the above embodiment, the floating undulating gate 1 has been described, but the technique disclosed in the present application also applies to a manual undulating gate in which the door body 10 is manually erected and laid down instead of the buoyancy of infiltrated water. Can be applied.

As described above, the technique disclosed in the present application is useful for undulating gates.

1 Undulating gate 10 Door body 12 Rotating shaft 20 Auxiliary drive unit 21 Base plate (transmission unit)
23 Counterweight (constant load part)
24,25 springs (elastic load part, coil spring, compression spring)
31 Wire rope (transmission part)
F Tensile force Fc Counterweight load (constant load)
Fs spring load (elastic load)
Mu Standing Moment Md Falling Moment R1 to R3 Lever Length (Distance between Verticals)
P1, P2 Manual power

Claims (4)

A door body having a rotating shaft and rotating around the rotating shaft to stand up,
It is provided with an auxiliary drive unit that exerts a tensile force on the door body to assist the standing operation of the door body.
The auxiliary drive unit
A constant load part that generates a constant load and
An elastic load is generated according to the amount of displacement, and it is provided in a state of being displaced by a predetermined amount from the natural length. As the door body stands up, the amount of displacement from the natural length decreases, and before the door body completes standing up. And the elastic load part configured so that the displacement amount becomes zero.
Connected to the door body, the constant load of the constant load portion and the elastic load of the elastic load portion act on the door body as the tensile force, and the distance between the vertical axes of the rotation axis with respect to the acting direction of the tensile force. An undulating gate, characterized in that the door body is provided with a transmission portion configured to be the longest in the middle of standing up. At the undulating gate according to claim 1,
The transmission unit
A base plate that is provided so as to be movable up and down, and the constant load of the constant load portion and the elastic load of the elastic load portion act upward or downward.
An undulating gate having one end connected to the base plate and the other end having a wire rope connected to the door body. At the undulating gate according to claim 2,
The undulating gate is characterized in that the wire rope is connected to the proximal end side of the door body. A door body having a rotating shaft and rotating and standing around the rotating shaft,
It is provided with an auxiliary drive unit that exerts a tensile force on the door body to assist the standing operation of the door body.
The auxiliary drive unit
In the initial stage of the standing operation of the door body including the falling state of the door body, the standing moment of the door body generated by the action of the tensile force becomes smaller than the falling moment of the door body.
In the latter stage of the standing operation of the door body including the standing completed state of the door body, the standing moment becomes larger than the lodging moment.
An undulating gate characterized in that the tensile force is changed so that the standing moment becomes about the same as the lodging moment in the middle stage between the early stage and the late stage of the standing operation.

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